Investigators at University of York Discuss Findings in Materials Science and Physical Chemistry (Using EPR Spectroscopy as a Unique Probe of Molecular-Scale Reorganization and Solvation in Self-Assembled Gel-Phase Materials)
By a News Reporter-Staff News Editor at Science Letter -- Data detailed on Science have been presented. According to news reporting originating from York, United Kingdom, by NewsRx correspondents, research stated, "We describe the synthesis of spin-labeled bis-ureas which coassemble with bis-urea gelators and report on self-assembly as detected using electron paramagnetic resonance spectroscopy (EPR). Specifically, EPR detects the gel-sol transition and allows us to quantify how much spin-label is immobilized within the gel fibers and how much is present in mobile solvent pools-as controlled by temperature, gelator structure, and thermal history."
Our news editors obtained a quote from the research from the University of York, "EPR is also able to report on the initial self-assembly processes below the gelation threshold which are not macroscopically visible and appears to be more sensitive than NMR to intermediate-sized nongelating oligomeric species. By studying dilute solutions of gelator molecules and using either single or double spin-labels, EPR allows quantification of the initial steps of the hierarchical self-assembly process in terms of cooperativity and association constant. Finally, EPR enables us to estimate the degree of gel-fiber solvation by probing the distances between spin-labels. Comparison of experimental data against the predicted distances assuming the nanofibers are only composed of gelator molecules indicates a significant difference, which can be assigned to the presence of a quantifiable number of explicit solvent molecules."
According to the news editors, the research concluded: "In summary, EPR provides unique data and yields powerful insight into how molecular-scale mobility and solvation impact on assembly of supramolecular gels."
For more information on this research see: Using EPR Spectroscopy as a Unique Probe of Molecular-Scale Reorganization and Solvation in Self-Assembled Gel-Phase Materials. Langmuir, 2014;30(30):9210-9218. Langmuir can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Langmuir - www.pubs.acs.org/journal/langd5)
The news editors report that additional information may be obtained by contacting A. Caragheorgheopol, University of York, Dept. of Chem, York YO10 5DD, N Yorkshire, United Kingdom. Additional authors for this research include W. Edwards, J.G. Hardy, D.K. Smith and V. Chechik (see also Science).
Keywords for this news article include: York, United Kingdom, Europe, Science
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